linux/drivers/s390/kvm/virtio_ccw.c
Heinz Graalfs 46f9c2b925 virtio_ring: change host notification API
Currently a host kick error is silently ignored and not reflected in
the virtqueue of a particular virtio device.

Changing the notify API for guest->host notification seems to be one
prerequisite in order to be able to handle such errors in the context
where the kick is triggered.

This patch changes the notify API. The notify function must return a
bool return value. It returns false if the host notification failed.

Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-10-29 11:28:11 +10:30

934 lines
22 KiB
C

/*
* ccw based virtio transport
*
* Copyright IBM Corp. 2012
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (version 2 only)
* as published by the Free Software Foundation.
*
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
*/
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/virtio_ring.h>
#include <linux/pfn.h>
#include <linux/async.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/kvm_para.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/cio.h>
#include <asm/ccwdev.h>
#include <asm/virtio-ccw.h>
/*
* virtio related functions
*/
struct vq_config_block {
__u16 index;
__u16 num;
} __packed;
#define VIRTIO_CCW_CONFIG_SIZE 0x100
/* same as PCI config space size, should be enough for all drivers */
struct virtio_ccw_device {
struct virtio_device vdev;
__u8 *status;
__u8 config[VIRTIO_CCW_CONFIG_SIZE];
struct ccw_device *cdev;
__u32 curr_io;
int err;
wait_queue_head_t wait_q;
spinlock_t lock;
struct list_head virtqueues;
unsigned long indicators;
unsigned long indicators2;
struct vq_config_block *config_block;
};
struct vq_info_block {
__u64 queue;
__u32 align;
__u16 index;
__u16 num;
} __packed;
struct virtio_feature_desc {
__u32 features;
__u8 index;
} __packed;
struct virtio_ccw_vq_info {
struct virtqueue *vq;
int num;
void *queue;
struct vq_info_block *info_block;
struct list_head node;
long cookie;
};
#define CCW_CMD_SET_VQ 0x13
#define CCW_CMD_VDEV_RESET 0x33
#define CCW_CMD_SET_IND 0x43
#define CCW_CMD_SET_CONF_IND 0x53
#define CCW_CMD_READ_FEAT 0x12
#define CCW_CMD_WRITE_FEAT 0x11
#define CCW_CMD_READ_CONF 0x22
#define CCW_CMD_WRITE_CONF 0x21
#define CCW_CMD_WRITE_STATUS 0x31
#define CCW_CMD_READ_VQ_CONF 0x32
#define VIRTIO_CCW_DOING_SET_VQ 0x00010000
#define VIRTIO_CCW_DOING_RESET 0x00040000
#define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
#define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
#define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
#define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
#define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
#define VIRTIO_CCW_DOING_SET_IND 0x01000000
#define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
#define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
#define VIRTIO_CCW_INTPARM_MASK 0xffff0000
static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
{
return container_of(vdev, struct virtio_ccw_device, vdev);
}
static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
{
unsigned long flags;
__u32 ret;
spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
if (vcdev->err)
ret = 0;
else
ret = vcdev->curr_io & flag;
spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
return ret;
}
static int ccw_io_helper(struct virtio_ccw_device *vcdev,
struct ccw1 *ccw, __u32 intparm)
{
int ret;
unsigned long flags;
int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
do {
spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
if (!ret) {
if (!vcdev->curr_io)
vcdev->err = 0;
vcdev->curr_io |= flag;
}
spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
cpu_relax();
} while (ret == -EBUSY);
wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
return ret ? ret : vcdev->err;
}
static inline long do_kvm_notify(struct subchannel_id schid,
unsigned long queue_index,
long cookie)
{
register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
register struct subchannel_id __schid asm("2") = schid;
register unsigned long __index asm("3") = queue_index;
register long __rc asm("2");
register long __cookie asm("4") = cookie;
asm volatile ("diag 2,4,0x500\n"
: "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
"d"(__cookie)
: "memory", "cc");
return __rc;
}
static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
{
struct virtio_ccw_vq_info *info = vq->priv;
struct virtio_ccw_device *vcdev;
struct subchannel_id schid;
vcdev = to_vc_device(info->vq->vdev);
ccw_device_get_schid(vcdev->cdev, &schid);
info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
if (info->cookie < 0)
return false;
return true;
}
static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
struct ccw1 *ccw, int index)
{
vcdev->config_block->index = index;
ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
ccw->flags = 0;
ccw->count = sizeof(struct vq_config_block);
ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
return vcdev->config_block->num;
}
static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
{
struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
struct virtio_ccw_vq_info *info = vq->priv;
unsigned long flags;
unsigned long size;
int ret;
unsigned int index = vq->index;
/* Remove from our list. */
spin_lock_irqsave(&vcdev->lock, flags);
list_del(&info->node);
spin_unlock_irqrestore(&vcdev->lock, flags);
/* Release from host. */
info->info_block->queue = 0;
info->info_block->align = 0;
info->info_block->index = index;
info->info_block->num = 0;
ccw->cmd_code = CCW_CMD_SET_VQ;
ccw->flags = 0;
ccw->count = sizeof(*info->info_block);
ccw->cda = (__u32)(unsigned long)(info->info_block);
ret = ccw_io_helper(vcdev, ccw,
VIRTIO_CCW_DOING_SET_VQ | index);
/*
* -ENODEV isn't considered an error: The device is gone anyway.
* This may happen on device detach.
*/
if (ret && (ret != -ENODEV))
dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
ret, index);
vring_del_virtqueue(vq);
size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
free_pages_exact(info->queue, size);
kfree(info->info_block);
kfree(info);
}
static void virtio_ccw_del_vqs(struct virtio_device *vdev)
{
struct virtqueue *vq, *n;
struct ccw1 *ccw;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return;
list_for_each_entry_safe(vq, n, &vdev->vqs, list)
virtio_ccw_del_vq(vq, ccw);
kfree(ccw);
}
static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
int i, vq_callback_t *callback,
const char *name,
struct ccw1 *ccw)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
int err;
struct virtqueue *vq = NULL;
struct virtio_ccw_vq_info *info;
unsigned long size = 0; /* silence the compiler */
unsigned long flags;
/* Allocate queue. */
info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
if (!info) {
dev_warn(&vcdev->cdev->dev, "no info\n");
err = -ENOMEM;
goto out_err;
}
info->info_block = kzalloc(sizeof(*info->info_block),
GFP_DMA | GFP_KERNEL);
if (!info->info_block) {
dev_warn(&vcdev->cdev->dev, "no info block\n");
err = -ENOMEM;
goto out_err;
}
info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
if (info->queue == NULL) {
dev_warn(&vcdev->cdev->dev, "no queue\n");
err = -ENOMEM;
goto out_err;
}
vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
true, info->queue, virtio_ccw_kvm_notify,
callback, name);
if (!vq) {
/* For now, we fail if we can't get the requested size. */
dev_warn(&vcdev->cdev->dev, "no vq\n");
err = -ENOMEM;
goto out_err;
}
/* Register it with the host. */
info->info_block->queue = (__u64)info->queue;
info->info_block->align = KVM_VIRTIO_CCW_RING_ALIGN;
info->info_block->index = i;
info->info_block->num = info->num;
ccw->cmd_code = CCW_CMD_SET_VQ;
ccw->flags = 0;
ccw->count = sizeof(*info->info_block);
ccw->cda = (__u32)(unsigned long)(info->info_block);
err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
if (err) {
dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
goto out_err;
}
info->vq = vq;
vq->priv = info;
/* Save it to our list. */
spin_lock_irqsave(&vcdev->lock, flags);
list_add(&info->node, &vcdev->virtqueues);
spin_unlock_irqrestore(&vcdev->lock, flags);
return vq;
out_err:
if (vq)
vring_del_virtqueue(vq);
if (info) {
if (info->queue)
free_pages_exact(info->queue, size);
kfree(info->info_block);
}
kfree(info);
return ERR_PTR(err);
}
static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char *names[])
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
unsigned long *indicatorp = NULL;
int ret, i;
struct ccw1 *ccw;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return -ENOMEM;
for (i = 0; i < nvqs; ++i) {
vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
ccw);
if (IS_ERR(vqs[i])) {
ret = PTR_ERR(vqs[i]);
vqs[i] = NULL;
goto out;
}
}
ret = -ENOMEM;
/* We need a data area under 2G to communicate. */
indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
if (!indicatorp)
goto out;
*indicatorp = (unsigned long) &vcdev->indicators;
/* Register queue indicators with host. */
vcdev->indicators = 0;
ccw->cmd_code = CCW_CMD_SET_IND;
ccw->flags = 0;
ccw->count = sizeof(vcdev->indicators);
ccw->cda = (__u32)(unsigned long) indicatorp;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
if (ret)
goto out;
/* Register indicators2 with host for config changes */
*indicatorp = (unsigned long) &vcdev->indicators2;
vcdev->indicators2 = 0;
ccw->cmd_code = CCW_CMD_SET_CONF_IND;
ccw->flags = 0;
ccw->count = sizeof(vcdev->indicators2);
ccw->cda = (__u32)(unsigned long) indicatorp;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
if (ret)
goto out;
kfree(indicatorp);
kfree(ccw);
return 0;
out:
kfree(indicatorp);
kfree(ccw);
virtio_ccw_del_vqs(vdev);
return ret;
}
static void virtio_ccw_reset(struct virtio_device *vdev)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct ccw1 *ccw;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return;
/* Zero status bits. */
*vcdev->status = 0;
/* Send a reset ccw on device. */
ccw->cmd_code = CCW_CMD_VDEV_RESET;
ccw->flags = 0;
ccw->count = 0;
ccw->cda = 0;
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
kfree(ccw);
}
static u32 virtio_ccw_get_features(struct virtio_device *vdev)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct virtio_feature_desc *features;
int ret, rc;
struct ccw1 *ccw;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return 0;
features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
if (!features) {
rc = 0;
goto out_free;
}
/* Read the feature bits from the host. */
/* TODO: Features > 32 bits */
features->index = 0;
ccw->cmd_code = CCW_CMD_READ_FEAT;
ccw->flags = 0;
ccw->count = sizeof(*features);
ccw->cda = (__u32)(unsigned long)features;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
if (ret) {
rc = 0;
goto out_free;
}
rc = le32_to_cpu(features->features);
out_free:
kfree(features);
kfree(ccw);
return rc;
}
static void virtio_ccw_finalize_features(struct virtio_device *vdev)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct virtio_feature_desc *features;
int i;
struct ccw1 *ccw;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return;
features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
if (!features)
goto out_free;
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
for (i = 0; i < sizeof(*vdev->features) / sizeof(features->features);
i++) {
int highbits = i % 2 ? 32 : 0;
features->index = i;
features->features = cpu_to_le32(vdev->features[i / 2]
>> highbits);
/* Write the feature bits to the host. */
ccw->cmd_code = CCW_CMD_WRITE_FEAT;
ccw->flags = 0;
ccw->count = sizeof(*features);
ccw->cda = (__u32)(unsigned long)features;
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
}
out_free:
kfree(features);
kfree(ccw);
}
static void virtio_ccw_get_config(struct virtio_device *vdev,
unsigned int offset, void *buf, unsigned len)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
int ret;
struct ccw1 *ccw;
void *config_area;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return;
config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
if (!config_area)
goto out_free;
/* Read the config area from the host. */
ccw->cmd_code = CCW_CMD_READ_CONF;
ccw->flags = 0;
ccw->count = offset + len;
ccw->cda = (__u32)(unsigned long)config_area;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
if (ret)
goto out_free;
memcpy(vcdev->config, config_area, sizeof(vcdev->config));
memcpy(buf, &vcdev->config[offset], len);
out_free:
kfree(config_area);
kfree(ccw);
}
static void virtio_ccw_set_config(struct virtio_device *vdev,
unsigned int offset, const void *buf,
unsigned len)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct ccw1 *ccw;
void *config_area;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return;
config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
if (!config_area)
goto out_free;
memcpy(&vcdev->config[offset], buf, len);
/* Write the config area to the host. */
memcpy(config_area, vcdev->config, sizeof(vcdev->config));
ccw->cmd_code = CCW_CMD_WRITE_CONF;
ccw->flags = 0;
ccw->count = offset + len;
ccw->cda = (__u32)(unsigned long)config_area;
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
out_free:
kfree(config_area);
kfree(ccw);
}
static u8 virtio_ccw_get_status(struct virtio_device *vdev)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
return *vcdev->status;
}
static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct ccw1 *ccw;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return;
/* Write the status to the host. */
*vcdev->status = status;
ccw->cmd_code = CCW_CMD_WRITE_STATUS;
ccw->flags = 0;
ccw->count = sizeof(status);
ccw->cda = (__u32)(unsigned long)vcdev->status;
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
kfree(ccw);
}
static struct virtio_config_ops virtio_ccw_config_ops = {
.get_features = virtio_ccw_get_features,
.finalize_features = virtio_ccw_finalize_features,
.get = virtio_ccw_get_config,
.set = virtio_ccw_set_config,
.get_status = virtio_ccw_get_status,
.set_status = virtio_ccw_set_status,
.reset = virtio_ccw_reset,
.find_vqs = virtio_ccw_find_vqs,
.del_vqs = virtio_ccw_del_vqs,
};
/*
* ccw bus driver related functions
*/
static void virtio_ccw_release_dev(struct device *_d)
{
struct virtio_device *dev = container_of(_d, struct virtio_device,
dev);
struct virtio_ccw_device *vcdev = to_vc_device(dev);
kfree(vcdev->status);
kfree(vcdev->config_block);
kfree(vcdev);
}
static int irb_is_error(struct irb *irb)
{
if (scsw_cstat(&irb->scsw) != 0)
return 1;
if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
return 1;
if (scsw_cc(&irb->scsw) != 0)
return 1;
return 0;
}
static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
int index)
{
struct virtio_ccw_vq_info *info;
unsigned long flags;
struct virtqueue *vq;
vq = NULL;
spin_lock_irqsave(&vcdev->lock, flags);
list_for_each_entry(info, &vcdev->virtqueues, node) {
if (info->vq->index == index) {
vq = info->vq;
break;
}
}
spin_unlock_irqrestore(&vcdev->lock, flags);
return vq;
}
static void virtio_ccw_int_handler(struct ccw_device *cdev,
unsigned long intparm,
struct irb *irb)
{
__u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
int i;
struct virtqueue *vq;
struct virtio_driver *drv;
/* Check if it's a notification from the host. */
if ((intparm == 0) &&
(scsw_stctl(&irb->scsw) ==
(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
/* OK */
}
if (irb_is_error(irb))
vcdev->err = -EIO; /* XXX - use real error */
if (vcdev->curr_io & activity) {
switch (activity) {
case VIRTIO_CCW_DOING_READ_FEAT:
case VIRTIO_CCW_DOING_WRITE_FEAT:
case VIRTIO_CCW_DOING_READ_CONFIG:
case VIRTIO_CCW_DOING_WRITE_CONFIG:
case VIRTIO_CCW_DOING_WRITE_STATUS:
case VIRTIO_CCW_DOING_SET_VQ:
case VIRTIO_CCW_DOING_SET_IND:
case VIRTIO_CCW_DOING_SET_CONF_IND:
case VIRTIO_CCW_DOING_RESET:
case VIRTIO_CCW_DOING_READ_VQ_CONF:
vcdev->curr_io &= ~activity;
wake_up(&vcdev->wait_q);
break;
default:
/* don't know what to do... */
dev_warn(&cdev->dev, "Suspicious activity '%08x'\n",
activity);
WARN_ON(1);
break;
}
}
for_each_set_bit(i, &vcdev->indicators,
sizeof(vcdev->indicators) * BITS_PER_BYTE) {
/* The bit clear must happen before the vring kick. */
clear_bit(i, &vcdev->indicators);
barrier();
vq = virtio_ccw_vq_by_ind(vcdev, i);
vring_interrupt(0, vq);
}
if (test_bit(0, &vcdev->indicators2)) {
drv = container_of(vcdev->vdev.dev.driver,
struct virtio_driver, driver);
if (drv && drv->config_changed)
drv->config_changed(&vcdev->vdev);
clear_bit(0, &vcdev->indicators2);
}
}
/*
* We usually want to autoonline all devices, but give the admin
* a way to exempt devices from this.
*/
#define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
(8*sizeof(long)))
static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
static char *no_auto = "";
module_param(no_auto, charp, 0444);
MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
{
struct ccw_dev_id id;
ccw_device_get_id(cdev, &id);
if (test_bit(id.devno, devs_no_auto[id.ssid]))
return 0;
return 1;
}
static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
{
struct ccw_device *cdev = data;
int ret;
ret = ccw_device_set_online(cdev);
if (ret)
dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
}
static int virtio_ccw_probe(struct ccw_device *cdev)
{
cdev->handler = virtio_ccw_int_handler;
if (virtio_ccw_check_autoonline(cdev))
async_schedule(virtio_ccw_auto_online, cdev);
return 0;
}
static void virtio_ccw_remove(struct ccw_device *cdev)
{
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
if (cdev->online) {
unregister_virtio_device(&vcdev->vdev);
dev_set_drvdata(&cdev->dev, NULL);
}
cdev->handler = NULL;
}
static int virtio_ccw_offline(struct ccw_device *cdev)
{
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
unregister_virtio_device(&vcdev->vdev);
dev_set_drvdata(&cdev->dev, NULL);
return 0;
}
static int virtio_ccw_online(struct ccw_device *cdev)
{
int ret;
struct virtio_ccw_device *vcdev;
vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
if (!vcdev) {
dev_warn(&cdev->dev, "Could not get memory for virtio\n");
ret = -ENOMEM;
goto out_free;
}
vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
GFP_DMA | GFP_KERNEL);
if (!vcdev->config_block) {
ret = -ENOMEM;
goto out_free;
}
vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
if (!vcdev->status) {
ret = -ENOMEM;
goto out_free;
}
vcdev->vdev.dev.parent = &cdev->dev;
vcdev->vdev.dev.release = virtio_ccw_release_dev;
vcdev->vdev.config = &virtio_ccw_config_ops;
vcdev->cdev = cdev;
init_waitqueue_head(&vcdev->wait_q);
INIT_LIST_HEAD(&vcdev->virtqueues);
spin_lock_init(&vcdev->lock);
dev_set_drvdata(&cdev->dev, vcdev);
vcdev->vdev.id.vendor = cdev->id.cu_type;
vcdev->vdev.id.device = cdev->id.cu_model;
ret = register_virtio_device(&vcdev->vdev);
if (ret) {
dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
ret);
goto out_put;
}
return 0;
out_put:
dev_set_drvdata(&cdev->dev, NULL);
put_device(&vcdev->vdev.dev);
return ret;
out_free:
if (vcdev) {
kfree(vcdev->status);
kfree(vcdev->config_block);
}
kfree(vcdev);
return ret;
}
static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
{
/* TODO: Check whether we need special handling here. */
return 0;
}
static struct ccw_device_id virtio_ids[] = {
{ CCW_DEVICE(0x3832, 0) },
{},
};
MODULE_DEVICE_TABLE(ccw, virtio_ids);
static struct ccw_driver virtio_ccw_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "virtio_ccw",
},
.ids = virtio_ids,
.probe = virtio_ccw_probe,
.remove = virtio_ccw_remove,
.set_offline = virtio_ccw_offline,
.set_online = virtio_ccw_online,
.notify = virtio_ccw_cio_notify,
.int_class = IRQIO_VIR,
};
static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
int max_digit, int max_val)
{
int diff;
diff = 0;
*val = 0;
while (diff <= max_digit) {
int value = hex_to_bin(**cp);
if (value < 0)
break;
*val = *val * 16 + value;
(*cp)++;
diff++;
}
if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
return 1;
return 0;
}
static int __init parse_busid(char *str, unsigned int *cssid,
unsigned int *ssid, unsigned int *devno)
{
char *str_work;
int rc, ret;
rc = 1;
if (*str == '\0')
goto out;
str_work = str;
ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
if (ret || (str_work[0] != '.'))
goto out;
str_work++;
ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
if (ret || (str_work[0] != '.'))
goto out;
str_work++;
ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
if (ret || (str_work[0] != '\0'))
goto out;
rc = 0;
out:
return rc;
}
static void __init no_auto_parse(void)
{
unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
char *parm, *str;
int rc;
str = no_auto;
while ((parm = strsep(&str, ","))) {
rc = parse_busid(strsep(&parm, "-"), &from_cssid,
&from_ssid, &from);
if (rc)
continue;
if (parm != NULL) {
rc = parse_busid(parm, &to_cssid,
&to_ssid, &to);
if ((from_ssid > to_ssid) ||
((from_ssid == to_ssid) && (from > to)))
rc = -EINVAL;
} else {
to_cssid = from_cssid;
to_ssid = from_ssid;
to = from;
}
if (rc)
continue;
while ((from_ssid < to_ssid) ||
((from_ssid == to_ssid) && (from <= to))) {
set_bit(from, devs_no_auto[from_ssid]);
from++;
if (from > __MAX_SUBCHANNEL) {
from_ssid++;
from = 0;
}
}
}
}
static int __init virtio_ccw_init(void)
{
/* parse no_auto string before we do anything further */
no_auto_parse();
return ccw_driver_register(&virtio_ccw_driver);
}
module_init(virtio_ccw_init);
static void __exit virtio_ccw_exit(void)
{
ccw_driver_unregister(&virtio_ccw_driver);
}
module_exit(virtio_ccw_exit);